My Quad 989s sound VERY nice with a c-j Premier Eleven-A, altho I'm now using New Generation-brand, Chinese-built 100W monoamps (that use 4 KT88s) in triode. They seem to have plenty of power in my medium-to-large room (c. 3600 cubic feet).
4 ohm electrostats like the Martin Logan Prodigy suck power, as a rule of thumb double the rating of your speaker if you play it loud and want it clear. My Prodigys at 4 ohm 300w max with a Mcintosh MC 500 hit the 500w peaks with my favorite music selections. My next upgrade will be the MC 602 or another MC 500 in bridged mode.
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